 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.preferences;

 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.preferences.IEclipsePreferences;
 import org.eclipse.core.runtime.preferences.IScopeContext;

 /**
  * Abstract super-class for scope context object contributed
  * by the Platform.
  *
  * @since 3.0
  */
 public abstract class AbstractScope implements IScopeContext {

     /*
      * @see org.eclipse.core.runtime.preferences.IScopeContext#getName()
      */
     public abstract String getName();

     /*
      * Default path hierarchy for nodes is /<scope>/<qualifier>.
      *
      * @see org.eclipse.core.runtime.preferences.IScopeContext#getNode(java.lang.String)
      */
     public IEclipsePreferences getNode(String qualifier) {
         if (qualifier == null)
             throw new IllegalArgumentException ();
         return (IEclipsePreferences) PreferencesService.getDefault().getRootNode().node(getName()).node(qualifier);
     }

     /*
      * @see org.eclipse.core.runtime.preferences.IScopeContext#getLocation()
      */
     public abstract IPath getLocation();

     /* (non-Javadoc)
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public boolean equals(Object obj) {
         if (this == obj)
             return true;
         if (!(obj instanceof IScopeContext))
             return false;
         IScopeContext other = (IScopeContext) obj;
         if (!getName().equals(other.getName()))
             return false;
         IPath location = getLocation();
         return location == null ? other.getLocation() == null : location.equals(other.getLocation());
     }

     /* (non-Javadoc)
      * @see java.lang.Object#hashCode()
      */
     public int hashCode() {
         return getName().hashCode();
     }
 }

